Fig. 8: Dependence of the first-order rate coefficient kI of HO2 + NO on [NO]0.

The error bar represents the fitting error of each kI obtained by model fitting of the temporal absorbance profiles of HO2 and OH radicals. The black line indicates a linear fitting curve with a slope of (8.7 ± 0.3) × 10‒12 cm3 molecule‒1 s‒1.